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  • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
  • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
  • C07D471/04—Ortho-condensed systems
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Definitions

• the present invention concerns tetrahydro ⁇ -carbolines having a broad therapeutic potential. It further relates to their preparation, compositions comprising them and their use as a medicine.
• the compounds of the present invention are novel and have an interesting broad- spectrum receptor-binding profile. In comparison to the structurally related known compounds, they surprisingly exhibit a greater therapeutic breadth.
• the present invention concerns the compounds of formula
• R 1 is hydrogen, C ⁇ _ 6 alkyl, aryl or C ⁇ _ 6 alkyl substituted with aryl;
• R 2 is each independently a halogen, hydroxy, Ci- ⁇ alkyl, C ⁇ _ 6 alkyloxy or nitro; n is 0, 1, 2 or 3; Al is Ci_6alkanediyl;
• D is 2(3H)benzoxazolone-3-yl or a radical of formula
• R 3 is hydrogen, C ⁇ -6 a_kyl, aryl or arylC ⁇ - 6 alkyl:
• R 4 is hydrogen, C ⁇ . 6 alkyl, C ⁇ . 6 alkyloxy, C ⁇ _ 6 alkylthio, amino, mono- or di(C ⁇ . 6 alkyl) amino or mono- or di(arylC ⁇ _6alkyl)amino;
• R 5 , R 6 , R 7 , R 10 , R 11 and R 12 each independently are hydrogen or C ⁇ _ 6 alkyl;
• R 8 and R 9 each independently are hydrogen, C ⁇ _ 6 alkyl or aryl; or R and R taken together may form a bivalent radical -R 4 -R 5 - of formula -CH 2 -CH 2 -CH 2 - (a- 1);
• -CH CH-O- (a-14); wherein one or where possible two or three hydrogen atoms in said radicals (a-6) to (a-14) each independently may be replaced by C ⁇ . 6 alkyl or aryl; and aryl is phenyl or phenyl substituted with a halogen or Ci- ⁇ al yl.
• halogen is generic to fluoro, chloro, bromo and iodo.
• C ⁇ _ alkyl defines straight and branched saturated hydrocarbons, having from 1 to 4 carbon atoms such as, for example, methyl, ethyl, propyl, butyl, 1-methylethyl, 1,1-dimethylethyl, 2-methylpropyl and the like.
• C ⁇ - 6 alkyl is meant to include C ⁇ _ 4 a_kyl and the higher homologues thereof having 5 or 6 carbon atoms such as, for example, pentyl, hexyl or the like.
• C ⁇ . ⁇ 0 alkyl is meant to include Chalky 1 radicals and the higher homologues thereof having 7 to 10 carbon atoms such as, for example, heptyl, octyl, nonyl, decyl and the like.
• C ⁇ _ alkanediyl defines bivalent straight or branch chained alkanediyl radicals having from 1 to 4 carbon atoms such as, for example, methylene, 1,2-ethanediyl,
• C ⁇ - 6 alkanediyl is meant to include d_ 4 alkanediyl and the higher homologues thereof having 5 or 6 carbon atoms such as, for example, 1,5-pentanediyl, 1,6-hexanediyl and the like;
• C ⁇ _6alkylidene defines bivalent straight or branch chained alkylidene radicals having from 1 to 6 carbon atoms such as, for example, methylene, ethylidene, 1 -propylidene, 1 -butylidene, 1-pentylidene, 1-hexylidene and the like.
• benzyl refers to phenylmethyl.
• Other names for the term ⁇ -carboline are 5H-pyrido[4,3-b]indole, 3-azacarbazole and 3-azarbazole.
• addition salts as mentioned herein are meant to comprise the therapeutically active addition salt forms which the compounds of formula (I) are able to form with appropriate acids, such as, for example, inorganic acids such as hydrohalic acids, e.g. hydrochloric or hydrobromic acid; sulfuric; nitric; phosphoric and the like acids; or organic acids such as, for example, acetic, propanoic, hydroxyacetic, lactic, pyruvic, oxalic, malonic, succinic, maleic, fumaric, malic, tartaric, citric, methanesulfonic, ethanesulfonic, benzenesulfonic, /. -toluenesulfonic, cyclamic, salicylic, /?-amino- salicylic, pamoic and the like acids.
• inorganic acids such as hydrohalic acids, e.g. hydrochloric or hydrobromic acid
• sulfuric nitric
• the pharmaceutically acceptable addition salts as mentioned hereinabove are also meant to comprise the therapeutically active non-toxic base, in particular, a metal or amine addition salt forms which the compounds of formula (I) are able to form.
• Said salts can conveniently be obtained by treating the compounds of formula (I) containing acidic hydrogen atoms with appropriate organic and inorganic bases such as, for example, the ammonium salts, the alkali and earth alkaline metal salts, e.g. the lithium, sodium, potassium, magnesium, calcium salts and the like, salts with organic bases, e.g.
• salt forms can be converted by treatment with an appropriate base or acid into the free acid or base form.
• addition salt as used hereinabove also comprises the solvates which the compounds of formula (I) are able to form and said solvates are meant to be included within the scope of the present invention.
• solvates are, e.g. the hydrates, alcoholates and the like.
• TV-oxide forms of the compounds of formula (I) are meant to comprise those compounds of formula (I) wherein one or several nitrogen atoms are oxidized to the so-called N-oxide.
• stereochemically isomeric forms as used herein defines all the possible isomeric forms in which the compounds of formula (I) may occur. Unless otherwise mentioned or indicated, the chemical designation of compounds denotes the mixture of all possible stereochemically isomeric forms, said mixtures containing all diastereomers and enantiomers of the basic molecular structure.
• a special group of compounds includes those compounds of formula (I) wherein one or more of the following restrictions apply: 1) R 2 is halogen, hydroxy, C ⁇ _ 6 alkyl or Ci- ⁇ alkyloxy; 2) n is 0 or l;
• Alk is C ⁇ . alkanediyl; preferably, Alk is 1,2-ethanediyl;
• D is a radical of formula (a) wherein R 3 is C ⁇ _ 6 alkyl, aryl or arylC ⁇ - 6 alkyl; R 4 is amino, mono- or di(C ⁇ - 6 alkyl) amino, or mono- or d ⁇ (arylC ⁇ _ 6 a_kyl)amino; or -R 4 -R 5 - is a radical of formula (a-2) or (a-5) wherein one or two hydrogen atoms each independently may be replaced by halogen, Ci- ⁇ alkyl, trifluoromethyl or
• C ⁇ _ 6 alkyloxy, or -R 4 -R 5 - is a radical of formula (a-6), (a-7), (a-8), (a-11), (a-13) or (a-14) wherein one or where possible two hydrogen atoms each independently may be replaced by Ci- ⁇ alkyl;
• D is a radical of formula (b) and R 6 and R 7 are suitably methyl; 6) D is a radical of formula (c) and R 8 is suitably hydrogen, methyl or phenyl;
• D is a radical of formula (d) wherein R 9 is aryl; and suitably, R 9 is 4-fluoro-phenyl, and the piperidine ring is connected in the 3- or 4-position to the remainder of the molecule; 8) D is a radical of formula (e) wherein X is S or NH and R 10 is hydrogen; or 9) D is a radical of formula (f) wherein X is S or NCH 3 .
• the R 2 substituent is suitably positioned in the 6-, 7- or 8-position of the ⁇ -carboline moiety, preferably in the 7- or 8-position, and R 2 is preferably chloro, fluoro, methyl, hydroxy or methoxy.
• D is a radical of formula (a), (d), (e) or (f).
• R 1 is hydrogen or aryl
• R 2 is halogen or C ⁇ -6 alkyl
• n is 0 or 1
• Alk is C ⁇ - alkanediyl
• D is a radical of formula (a) or (e), especially a radical of formula (a) wherein R 3 is
• C ⁇ _ 6 alkyl and -R 4 -R 5 - is a radical of formula (a-2), (a-5), (a-6), (a-7) or (a-8) wherein one or where possible two hydrogen atoms each independently may be replaced by
• R 1 is hydrogen or Ci- ⁇ alkyl
• R 2 is halogen, C ⁇ _ 6 alkyl or C ⁇ _ 6 alkyloxy
• n is 0 or
• Alk is C ⁇ _ 4 alkanediyl
• D is a radical of formula (a) or (f), especially a radical of formula (a) wherein R 4 is amino, mono- or di(C ⁇ _6alkyl)amino or mono- or di(arylC ⁇ _ 6 alkyl)amino, or -R 4 -R 5 - is a radical of formula (a-2), (a-5), (a-6), (a-7), (a-8) or (a-11) wherein one or where possible two hydrogen atoms each independently may be replaced by Ci- ⁇ alkyl or a radical of formula (f) wherein X is NR 12 .
• Yet another interesting group of compounds includes those compounds of formula (I) wherein R 2 is halogen, hydroxy, C ⁇ . 6 a_kyl or C ⁇ . 6 alkyloxy; n is 0 or 1, Alk is
• D is a radical of formula (a), (e) or (f), especially a radical of formula (a) wherein R 3 is C ⁇ _6alkyl, R 4 is amino, or -R 4 -R 5 - is a radical of formula (a-2) or (a-5) wherein one or two hydrogen atoms each independently may be replaced by halogen, C ⁇ - 6 alkyl, trifluoromethyl or C ⁇ -6 alkyloxy, or -R 4 -R 5 - is a radical of formula (a-6), (a-7), (a-8), (a-11), (a-13) or (a-14) wherein one or where possible two hydrogen atoms each independently may be replaced by C ⁇ _ 6 alkyl, or a radical of formula (e) wherein X is S or NR 12 and R 10 is hydrogen, or a radical of formula (f) wherein X is S or NR 12 .
• Still another interesting group of compounds includes those compounds of formula (I) wherein R 1 is hydrogen, Ci- ⁇ lkyl or aryl; R 2 is halogen, C ⁇ - 6 alkyl or C ⁇ _ 6 alkyloxy; n is 0 or 1; Alk is C ⁇ - alkanediyl; D is a radical of formula (a), (d) or (e), especially a radical of formula (a) wherein R 3 is Ci- ⁇ alkyl or arylC ⁇ .
• -R 4 -R 5 - is a radical of formula (a-5) wherein one or two hydrogen atoms each independently may be replaced by a halogen, or -R 4 -R 5 - is a radical of formula (a-6) or (a-8), or a radical of formula (d) wherein R 9 is aryl, or a radical of formula (e) wherein X is S or NR 12 and R 10 is hydrogen.
• Particular compounds are those compounds of formula (I) wherein R 1 is hydrogen; n is 0 or n is 1 whereby R 2 is a halogen, Ci- ⁇ alkyl, or C ⁇ _ 6 alkoxy; Alk is 1 ,2-ethanediyl and D is a radical of formula (a) or (f), especially a radical of formula (a) wherein R 3 is Ci.
• R 4 is amino, R 5 is Ci- ⁇ alkyl, or -R 4 -R 5 - is a radical of formula (a-2), (a-5), (a-6), (a-7), (a-8) or (a-11) wherein one hydrogen atom may be replaced by C ⁇ _ 6 alkyl, or a radical of formula (f) wherein X is NR 12 and R 11 is C ⁇ _ 6 alkyl; more in particular, wherein R 1 is hydrogen; n is 0 or n is 1 whereby R 2 is a chloro, methyl, or methoxy; Alk is 1 ,2-ethanediyl and D is a radical of formula (a) wherein R 3 is methyl, R 4 is amino, R 5 is methyl, or -R 4 -R 5 - is a radical of formula (a-2), (a-5), (a-6), (a-7), (a-8) or (a-11) wherein one hydrogen atom may be replaced by methyl, or D is a radical of
• R 1 is hydrogen; n is 0 or n is 1 whereby R 2 is a halogen or C ⁇ _ 6 alkyl; Alk is 1,2-ethane- diyl and D is a radical of formula (a), especially a radical of formula (a) wherein R 3 is C ⁇ _ 6 alkyl, R 4 and R 5 are taken together to form -R 4 -R 5 - of formula (a-2), (a-5), (a-6), (a-7) or (a-8) wherein one hydrogen atom may be replaced by C ⁇ _6alkyl; more in particular, wherein R 1 is hydrogen; n is 0 or n is 1 whereby R 2 is a chloro, fluoro or methyl; Alk is 1 ,2-ethanediyl and D is a radical of formula (a) wherein R 3 is methyl, R 4 and R 5 are taken together to form -R 4 -R 5 - of formula (a-2), (a-5), (
• a preferred set of compounds includes those compounds of formula (I) wherein R 1 is hydrogen, methyl, /.-butyl, phenyl, benzyl or 4-fluoro-phenyl.
• the compounds of formula (I) can generally be prepared by N-alkylating a 1,3,4,5- tetrahydro-2H-pyrido[4,3-b]indole derivative of formula (II) with an alkylating reagent of formula (III) following the procedure described in EP-A-0,037,265, EP-A-0,070,053, EP-A-0,196,132 and in EP-A-0,378,255.
• intermediate (III) wherein W* represents an appropriate reactive leaving group such as, for example, a halogen, e.g. chloro, bromo or iodo; a sulfonyloxy, e.g. methanesulfonyloxy, toluenesulfonyloxy, may be reacted with an intermediate of formula (II) in a reaction-inert solvent such as, for example, N,N-dimethylformamide or methylisobutylketon, in the presence of a suitable base such as, for example, sodiumcarbonate or triethylamine, and optionally in the presence of a catalyst such as, for example, potassium iodide.
• a reaction-inert solvent such as, for example, N,N-dimethylformamide or methylisobutylketon
• reaction products may be isolated from the reaction medium and, if necessary, further purified according to methodologies generally known in the art such as extraction, crystallization, trituration and chromatography.
• the compounds of formula (I) wherein D is a radical of formula (e), being represented by formula (I-e), may be prepared by N-acylating an intermediate of formula (IV) with an acyl derivative of formula (V) wherein W ⁇ is an appropriate reactive leaving group such as, for example, a halogen, in a reaction-inert solvent such as, for example, chloroform, in the presence of a suitable base such as, for example, sodium carbonate
• the compounds of formula (I) wherein D is a radical of formula (f), being represented by formula (I-f), can be prepared by _V-alkylating an amine of formula (VI) with an intermediate of formula (VII) wherein W ⁇ is an appropriate reactive leaving group such as, for example, a halogen, in a reaction-inert solvent such as, for example, ethanol or toluene, in the presence of a suitable base such as, for example, sodiumbicarbonate or sodiumcarbonate.
• a reaction-inert solvent such as, for example, ethanol or toluene
• intermediates (VI) may be N-alkylated with intermediates (VII) m the presence of copper
• the compounds of formula (I) may be converted into each other following art-known functional group transformation reactions
• the compounds of lormula (I) may also be converted to the corresponding /V-oxide lorms following art-known procedures for converting a tnvalent nitrogen into its _V-ox ⁇ de form Said N-oxidation reaction may generally be earned out by reacting the starting material of formula (I) with an appropriate organic or inorganic peroxide.
• Appropriate inorganic peroxides comprise, for example, hydrogen peroxide, alkali metal or earth alkaline metal peroxides, e g sodium peroxide, potassium peroxide;
• appropriate organic peroxides may comprise peroxy acids such as, for example, benzenecarboperoxoic acid or halo substituted benzenecarboperoxoic acid, e g
• solvents are, for example, water, lower alkanols, e g ethanol and the like, hydrocarbons, e g toluene, ketones, e.g 2-butanone, halogenated hydrocarbons, e g dichloromethane, and mixtures of such solvents
• Intermediates of formula (II) wherein R 1 is hydrogen can generally be prepared by reacting an intermediate of formula (VIII) wherein P is a protective group such as, for example, an alkyloxy- carbonyl group, with an intermediate of formula (IX) in a reaction-mert solvent, thus forming an intermediate of formula (X), and subsequently removing the protective group using art-known techniques such as, for instance, mixing the intermediate of formula (X) with potassium hydroxide m 2-propanol
• the intermediate of formula (X) may be further reacted with a reagent of formula (XI) wherein R 1 is the same as R 1 but other than hydrogen and W 4 is a suitable leaving group such as, for example, a halogen, m a suitable solvent such as, for example, hexamethylphosphorous t ⁇ amide and the like, in the presence of an appropriate base such as, for example, sodium hyd ⁇ de, thus forming an intermediate of formula (X
• Intermediates of formula (IV) can be prepared by N-alkylatmg an intermediate of formula (II) with an intermediate of formula (XIII) wherein P is a protective group such as, for example, an alkyloxycarbonyl group, and W 5 is a suitable leaving group such as, for example, a/.-toluenesulfonyloxy group and the like, in a reaction-inert solvent such as, for example, N,N-d ⁇ methylformam ⁇ de, and m the presence of a suitable base such as, for example, sodium carbonate
• a reaction-inert solvent such as, for example, N,N-d ⁇ methylformam ⁇ de
• a suitable base such as, for example, sodium carbonate
• Intermediates of formula (VI) may be prepared by N-alkylating an intermediate of formula (II) with an intermediate of formula (XIV) wherein P is a protective group such as, for example, an alkyloxycarbonyl group, and W 6 is a suitable leaving group such as, for example, a halogen, in a reaction-inert solvent such as, for example, methy sobutylketon, in the presence of a suitable base such as, for example, sodium carbonate, and optionally in the presence of a catalyst such as, for instance, potassium iodide
• P is a protective group such as, for example, an alkyloxycarbonyl group
• W 6 is a suitable leaving group such as, for example, a halogen
• a reaction-inert solvent such as, for example, methy sobutylketon
• a suitable base such as, for example, sodium carbonate
• a catalyst such as, for instance, potassium iodide
• Intermediates of formula (VI) wherein Alk is 1,3-propaned ⁇ yl and R ⁇ is hydrogen, said intermediates being represented by formula (VI-3) may suitably be prepared by reacting an intermediate of formula (II) with acrylonitnle m a reaction-inert solvent such as, for example, 2-propanol, and in the presence of a suitable catalyst such as, for example, a quaternary ammonium compound, e g A quat 336, thus forming a nitnle denvative of formula (XV) which may subsequently be reduced to the corresponding amme denvative using art-known reduction techniques as there are, for example, the use of hydrogen with Raney Nickel as a catalyst in methanol, optionally in the presence of ammonia
• Intermediates of formula (VI) wherein Alk is 1 ,4-butaned ⁇ yl and R > ⁇ 11 is hydrogen, said intermediates being represented by formula (VI-4) may suitably be prepared by reacting an intermediate of formula (II) with an intermediate of formula (XVI) wherein W 7 is a suitable leaving group such as, for example a halogen, in a reaction-mert solvent such as, for example, methyhsobutylketon, and in the presence of a suitable base such as, for example, sodium carbonate, and optionally in the presence of a catalyst such as, for instance, potassium iodide, thus forming a nitnle derivative of formula (XVII) which may subsequently be reduced to the corresponding amine denvative using art-known reduction techniques as there are, for example, the use of hydrogen with Raney Nickel as a catalyst in methanol, optionally in the presence of ammonia.
• a reaction-mert solvent such as, for example, methyhsobuty
• Some of the compounds of fonnula (I) and some of the intermediates in the present invention contain at least one asymmetric carbon atom. Pure stereochemically isomeric forms of said compounds and said intermediates can be obtained by the application of art-known procedures. For example, diastereoisomers can be separated by physical methods such as selective crystallization or chromatographic techniques, e.g. counter current distribution, liquid chromatography and the like methods.
• Enantiomers can be obtained from racemic mixtures by first converting said racemic mixtures with suitable resolving agents such as, for example, chiral acids, to mixtures of diastereomeric salts or compounds; then physically separating said mixtures of diastereomeric salts or compounds by, for example, selective crystallization or chromatographic techniques, e.g. liquid chromatography and the like methods; and finally converting said separated diastereomeric salts or compounds into the corresponding enantiomers.
• suitable resolving agents such as, for example, chiral acids
• Pure stereochemically isomeric forms of the compounds of formula (I) may also be obtained from the pure stereochemically isomeric fonns of the appropriate intermediates and starting materials, provided that the intervening reactions occur stereospecifically.
• the pure and mixed stereochemically isomeric forms of the compounds of formula (I) are intended to be embraced within the scope of the present invention.
• serotonin receptors such as, 5 -hydroxy tryptamine receptors of the 5HT and 5-HT 2 -type
• the present compounds also bind as ligands on the ⁇ 2 - or dopamine receptors, or selectively inhibit serotonin reuptake. This broad-spectrum receptor-binding profile of the present compounds gives them a great therapeutic breadth.
• serotonin is a potent broncho- and vasoconstnctor and thus the present compounds acting as antagonists on the serotonin receptors may also be used against hypertension and vascular disorders such as, migraine and migraine related disorders
• Compounds controlling the serotonergic system have been associated with a number of other properties such as, the suppression of appetite and promotion of weight loss, which may prove effective in combatting obesity, the alleviation of withdrawal symptoms in addicts trying to discontinue drinking and smoking habits, and also with gastrointestinal disorders such as, e.g colonkinetic disturbances
• An additional feature of the present compounds is that they have central 0.2-adrenoceptor antagonistic activity
• Central ovj-adrenoceptor antagonists are known to increase noradrenahne release by blocking presynaptic 0.2-receptors which exert an inhibiting control over the release of the neurotransmitter
• 0.2-antagomsts can be used particularly for the treatment or prophylaxis of depression, and are also potentially useful in the treatment of Alzheimer's disease and dementia as it is known that ⁇ 2-antagomsts promote the release of acetylcholme (Tellez et al 1997, J Neurochem 68 778-785)
• a particular group of the present compounds exhibits a pronounced affinity for dopaminergic receptors which in combination with an affinity for serotonergic receptors is of therapeutic significance m the treatment of psychosis
• the 5-HT 2 receptor-bindmg profile of the compounds of formula (I) is discussed m the pharmacological example C 1
• the binding profile for other recptors such as, the ⁇ 2-adrenerg ⁇ c or the dopaminergic receptors, may be demonstrated using analogous radioligand binding studies
• the serotonergic properties of the present compounds may be evidenced by the "apomorphine, tryptamme, norepmephrine (ATN) test in rats", descnbed in Arch Int Pharmacodyn , 227, 238-253 (1977)
• the present invention thus relates to compounds of formula (I) as defined heremabove for use as a medicine Also, the present invention relates to the use of the present compounds for the manufacture of a medicament for treating depression, anxiety and psychosis.
• the present invention provides a method of treating warm-blooded animals suffering from such disorders, in particular depression, anxiety and psychosis, said method comprising the systemic administration of a therapeutic effective amount of a compound of formula (I), a N-oxide or a pharmaceutically acceptable addition salt thereof, effective in treating disorders associated with the serotonergic system
• an effective therapeutic daily amount would be from about 0.01 mg/kg to about 4 mg/kg body weight.
• the exact dosage to be used in the treatment of any of the above-mentioned disorders must be subjectively determined by the attending physician.
• the variables involved include the severity of the disorder and the size, age and response pattern of the patient.
• the subject compounds may be formulated into various pharmaceutical compositions comprising a pharmaceutically acceptable carrier and, as active ingredient, a therapeutically effective amount of a compound of formula (I).
• a pharmaceutically acceptable carrier which may take a wide variety of forms depending on the form of preparation desired for administration.
• These pharmaceutical compositions are desirably in unitary dosage form suitable, preferably, for administration orally, percutaneously, or by parenteral injection.
• any of the usual pharmaceutical media may be employed, such as, for example, water, glycols, oils, alcohols and the like in the case of oral liquid preparations such as suspensions, syrups, elixirs and solutions; or solid carriers such as starches, sugars, kaolin, lubricants, binders, disintegrating agents and the like in the case of powders, pills, capsules and tablets. Because of their ease in administration, tablets and capsules represent the most advantageous oral dosage unit form, in which case solid pharmaceutical carriers are obviously employed.
• the carrier will usually comprise sterile water, at least in large part, though other ingredients, for example, to aid solubility, may be included.
• Injectable solutions may be prepared in which the carrier comprises saline solution, glucose solution or a mixture of saline and glucose solution.
• Injectable solutions containing compounds of formula (I) may be formulated in an oil for prolonged action.
• Appropriate oils for this purpose are, for example, peanut oil, sesame oil, cottonseed oil, corn oil, soy bean oil, synthetic glycerol esters of long chain fatty acids and mixtures of these and other oils, injectable suspensions may also be prepared in which case appropriate liquid carriers, suspending agents and the like may be employed.
• the carrier optionally comprises a penetration enhancing agent and/or a suitable wettable agent, optionally combined with suitable additives of any nature in minor proportions, which additives do not cause any significant deleterious effects on the skin. Said additives may facilitate the administration to the skin and/or may be helpful for preparing the desired compositions.
• These compositions may be administered in various ways, e.g., as a transdermal patch, as a spot-on or as an ointment. Addition salts of (I) due to their increased water solubility over the corresponding free base or free acid form, are obviously more suitable in the preparation of aqueous compositions.
• Dosage unit form as used in the specification and claims herein refers to physically discrete units suitable as unitary dosages, each unit containing a predetermined quantity of active ingredient calculated to produce the desired therapeutic effect, in association with the required pharmaceutical carrier.
• dosage unit forms are tablets (including scored or coated tablets), capsules, pills, powder packets, wafers, injectable solutions or suspensions, teaspoonfuls, tablespoonfuls and the like, and segregated multiples thereof.
• Example A.2 a) A mixture of 2,3,4,5-tetrahydro-8-methyl-lH-pyrido[4,3-b]indole, (0.079 mol), ethyl 3-chloropropanamide (0.097 mol), Na 2 C0 3 (15 g) and potassium iodide (0.1 g) in methyl isobutyl ketone (350 ml) was stirred and refluxed overnight. The reaction mixture was filtered and the filtrate was evaporated, yielding 20 g (80%) of ethyl [3-(l,3,4,5-tetrahydro-8-methyl-2H-pyrido[4,3-b]indol-2-yl)propyl]carbamate (intermediate 10).
• Tables 2 to 8 list compounds of formula (I) which were prepared according to one of the above examples as indicated in the column "Ex No.”.
• 5HT 2 receptors were measured by radioligand binding studies either in homogenates from rat brains or in a membranes fraction prepared from L929sA cells (mouse fibro carcinoma cells), stably transfected with human 5HT 2A receptor cDNA. Sample preparation 5HT 2 binding in rat. frontal cortex
• 5HT 2 receptors were measured in a rat frontal cortex membrane fraction. Herefore wistar rats were killed by decapitation, brains were removed and frontal cortex was dissected. The frontal cortex was homogenized in Tris-HCL buffer 50 mM pH7.7.
• the homogenate was centrifuged at 23.000 g for 10 minutes. The resulting pellet was washed twice by resuspension and recentrifugation and the pellet was finally suspended in Tris-HCL buffer 50 mM pH7.7 in a dilution of 100 (vol/wet weight of tissue). 400 ⁇ l of the homogenate was incubated with 1 nM [ 3 H]ketanserin in a total incubation volume of 0.5 ml for 30 minutes at 37 ° C. The incubation was stopped by rapid filtration using a manual filtration manifold. The filters were rinsed twice with ice-cold buffer and were counted in a liquid scintillation counter. Non-specific binding was determined in the presence of 1 ⁇ M methysergide. 5HT 2 binding in L929sA cells
• L929sA cells expressing human 5HT 2A receptors were cultured in Petri dishes in DMEM medium (Gibco catnr. 41965-039) enriched with 5 % heat inactivated fetal calf serum and in the presence of penicillin and streptomycin sulphate. 24 h before collection, cells were induced with m-interferon-b (1000 U/ml medium). Cells were collected by scrapping and centrifugation at low speed (5 minutes at 1500 g). The cells were homogenized and centrifuged for 10 minutes at 23.000 g. The resulting pellet was diluted in Tris-HCl 50 mM pH 7.7 and stored at -70 ° C.
• Example C.2 In vitro binding affinity for 0.2 receptors
• a low concentration of a radioligand with a high binding affinity for a particular receptor is incubated with a sample of a tissue preparation enriched in a particular receptor or with a preparation of cells expressing cloned human receptors in a buffered medium. During the incubation, the radioligand binds to the receptor.
• the receptor bound radioactivity is separated from the non-bound radioactivity, and the receptor bound activity is counted.
• the interaction of the test compounds with the receptor is assessed in competition binding experiments.
• Various concentrations of the test compound are added to the incubation mixture containing the receptor preparation and the radioligand. Binding of the radioligand will be inhibited by the test compound in proportion to its binding affinity and its concentration.
• the radioligand used for 0.2 receptor binding was 3 H-clonidine and the tissue preparation used was the cortex of the rat.
• the compounds with number 1 to 11, 13, 14, 16, 17, 20, 23 to 41, 43, 52 to 57, 60, 63, 66 to 74, 81 to 89 and 96 to 98 produced an inhibition of more than 50 % at a test concentration of 10 " " M or less, and the other compounds produced an inhibition of less than 50 % at a test concentration of 10 ⁇ M.
• Active ingredient as used throughout these examples relates to a compound of formula (I), a pharmaceutically acceptable addition salt or a stereochemically isomeric form thereof.
• a mixture of 100 g of the A.I., 570 g lactose and 200 g starch is mixed well and thereafter humidified with a solution of 5 g sodium dodecyl sulfate and 10 g polyvinyl- pyrrolidone in about 200 ml of water.
• the wet powder mixture is sieved, dried and sieved again.
• 100 g macrocrystalline cellulose and 15 g hydrogenated vegetable oil are added.
• the whole is mixed well and compressed into tablets, giving 10.000 tablets, each comprising 10 mg of the active ingredient.
• Example D.4 Injectable solution 1.8 Grams methyl 4-hydroxybenzoate and 0.2 grams propyl 4-hydroxybenzoate were dissolved in about 0.5 1 of boiling water for injection. After cooling to about 50°C there were added while stirring 4 grams lactic acid, 0.05 grams propylene glycol and 4 grams of the A.I.. The solution was cooled to room temperature and supplemented with water for injection q.s. ad 1 1, giving a solution comprising 4 mg/ml of A.I.. The solution was sterilized by filtration and filled in sterile containers.

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